Which object takes more energy to push up a ramp: a file cabinet, a refrigerator, a piano, or a sleepy dog? Find out in this ramp simulation when you change the angle of the incline, change the objects, or change the friction on the ramp.

Learn about conservation of energy with a skater dude. Build tracks, ramps, and jumps for the skater and view the kinetic energy, potential energy and friction as he moves.

Build tracks, ramps and jumps in a skate park to learn about energy.